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s From YaST it is difficult to make sure the same interface name (in other words, eth0) is always used for the Tip same network board if more than one network board is present in your server, especially if both network boards use the same kernel module as a driver. If you want to make sure eth0 is always connected to the same network board, edit the configuration file /etc/udev/rules.d/30-net_persistent_names.rules. In this file you can add a device name such as eth0 to a specific MAC address, thus making sure the device is always using the same device name.

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Hardware Configuration Name: Enter any string that makes it easier for you to recognize the network card. Module Name: If a specific kernel module is installed on your server and you need to call that module to use your network card, refer to the name of the kernel module here. Notice that it is rare that the proper kernel module is not detected automatically and you have to specify its module by hand. See also 29 for more details about kernel configuration. Options: For some other types of network card, it may be necessary to enter device options. If you use them, specify them in the format option=value, such as irq=5. Most modern Ethernet network cards don t need these options. PCMCIA: Check this option if you are using a PCMCIA network card. USB: Check this option if you are using a USB network card.

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When the software recognizes all the network boards, you can enter their properties on the Network Address Setup screen shown in Figure 13-5. On the General tab, you can enter some generic options for your network board. On the Address tab, you can set the address properties of the selected network board.

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In addition, you can specify how the IP addressing of the device should be handled. First, you need to choose between Automatic Address Setup, in which a DHCP server delivers an IP address to your server, and Static Address Setup. Because the services offered by your server always need to be contacted on the same IP address, it is uncommon to configure a server for Automatic Address Setup (unless your DHCP server is set up to provide the IP address for the specific MAC address in use on your server using the host option). If the DHCP server determined what address the server is using, its IP address may change. Therefore, in most scenarios you should select Static Address Setup and specify an IP address that is valid for the network to which your server is connected. Together with a subnet mask, which needs to be configured on all network cards, this is enough information for your server to work with on the local network. However, if your server needs to be able to connect to computers on other networks, it needs more information. For instance, most servers need the address of a default router that they can use to connect to computers on other networks. Also, if from your server you want to be able to use computer names instead of meaningless IP addresses, you need to configure the address of a DNS name server as well. To configure the DNS server that should be used, click the Hostname and Name Server button under Detailed Settings. This opens the Hostname and Name Server Configuration screen shown in